直接上代码，简单粗暴
calcnew函数中的参数意思
type:1日出2日落
latitude:纬度
longitude:经度
year:年
mos:月
day:日
函数的用法:calcnew(1, 39.020649999999996, 117.65270000000001, 2018, 10, 24)
function calcnew(type, latitude, longitude, year, mos, day) {
var mos = mos-1
longitude = -parseFloat(longitude); //getLongitude(latLongForm);
var JD = (calcJD(parseFloat(year), parseFloat(mos), parseFloat(day)));
var dow = calcDayOfWeek(JD);
var doy = calcDayOfYear(parseFloat(mos), parseFloat(day), parseFloat(year));
var T = calcTimeJulianCent(JD);
var alpha = calcSunRtAscension(T);
var nosunrise = false;
var riseTimeGMT = calcSunriseUTC(JD, latitude, longitude);
if (!isNumber(riseTimeGMT)) {
nosunrise = true;
}
// Calculate sunset for this date
// if no sunset is found, set flag nosunset
var nosunset = false;
var setTimeGMT = calcSunsetUTC(JD, latitude, longitude);
if (!isNumber(setTimeGMT)) {
nosunset = true;
}
var daySavings = YesNo[0].value; // = 0 (no) or 60 (yes)
var zone = -8; //latLongForm["hrsToGMT"].value;
if (zone > 12 || zone < -12.5) {
//alert("The offset must be between -12.5 and 12. \n Setting \"Off-Set\"=0");
//zone = "0";
//latLongForm["hrsToGMT"].value = zone;
}
var riseTimeLST = riseTimeGMT - (60 * zone) + daySavings;
// in minutes
var riseStr = timeStringShortAMPM(riseTimeLST, JD);
var setTimeLST = setTimeGMT - (60 * zone) + daySavings;
var setStr = timeStringShortAMPM(setTimeLST, JD);
//返回日出时间
if (type == 1) {
var arr1 = riseStr.split(":");
return new Date(year, mos, day, arr1[0], arr1[1], 0);
}
//返回日落时间
else if (type == 2) {
var arr2 = setStr.split(":");
return new Date(year, mos, day, arr2[0], arr2[1], 0);
}
}
//***********************************************************************/
//* DATA STRUCTURES 日出日落时间 */
//***********************************************************************/
function month(name, numdays, abbr) {
this.name = name;
this.numdays = numdays;
this.abbr = abbr;
}
//*********************************************************************/
function ans(daySave, value) {
this.daySave = daySave;
this.value = value;
}
//*********************************************************************/
function city(name, lat, lng, zoneHr) {
this.name = name;
this.lat = lat;
this.lng = lng;
this.zoneHr = zoneHr;
}
//***********************************************************************/
//* Data for Selectbox Controls */
//***********************************************************************/
var monthList = new Array(); // list of months and days for non-leap year
var i = 0;
monthList[i++] = new month("1", 31, "Jan");
monthList[i++] = new month("2", 28, "Feb");
monthList[i++] = new month("3", 31, "Mar");
monthList[i++] = new month("4", 30, "Apr");
monthList[i++] = new month("5", 31, "May");
monthList[i++] = new month("6", 30, "Jun");
monthList[i++] = new month("7", 31, "Jul");
monthList[i++] = new month("8", 31, "Aug");
monthList[i++] = new month("9", 30, "Sep");
monthList[i++] = new month("10", 31, "Oct");
monthList[i++] = new month("11", 30, "Nov");
monthList[i++] = new month("12", 31, "Dec");
//*********************************************************************/
var YesNo = new Array(); //Daylight Saving array
i = 0;
YesNo[i++] = new ans("No", 0);
YesNo[i++] = new ans("Yes", 60);
//*********************************************************************/
var City = new Array();
j = 0;
City[j++] = new city("", 0, 0, 0);
City[j++] = new city("中国城市", 0, 0, 0);
City[j++] = new city("北京", 39.9, -115.4, -8);
City[j++] = new city("天津", 39.1, -116.2, -8);
City[j++] = new city("上海", 31.2, -120.4, -8);
City[j++] = new city("石家庄", 38.0, -113.4, -8);
City[j++] = new city("太原", 37.8, -111.5, -8);
City[j++] = new city("呼和浩特", 40.8, -110.7, -8);
City[j++] = new city("大连", 38.9, -120.6, -8);
City[j++] = new city("沈阳", 41.8, -122.4, -8);
City[j++] = new city("长春", 43.9, -124.3, -8);
City[j++] = new city("吉林", 43.8, -125.5, -8);
City[j++] = new city("哈尔滨", 45.7, -125.6, -8);
City[j++] = new city("济南", 36.6, -117.0, -8);
City[j++] = new city("青岛", 36.0, -119.3, -8);
City[j++] = new city("烟台", 37.5, -120.4, -8);
City[j++] = new city("西安", 34.2, -107.9, -8);
City[j++] = new city("兰州", 36.0, -102.7, -8);
City[j++] = new city("西宁", 36.6, -100.8, -8);
City[j++] = new city("南京", 32.0, -117.7, -8);
City[j++] = new city("无锡", 31.5, -119.3, -8);
City[j++] = new city("苏州", 31.3, -119.6, -8);
City[j++] = new city("徐州", 34.2, -116.1, -8);
City[j++] = new city("合肥", 31.8, -116.6, -8);
City[j++] = new city("杭州", 30.2, -119.1, -8);
City[j++] = new city("宁波", 29.8, -120.5, -8);
City[j++] = new city("南昌", 28.6, -114.9, -8);
City[j++] = new city("九江", 29.7, -114.9, -8);
City[j++] = new city("武汉", 30.5, -113.2, -8);
City[j++] = new city("长沙", 28.2, 111.9, -8);
City[j++] = new city("湘潭", 27.8, -111.9, -8);
City[j++] = new city("乌鲁木齐", 43.8, -86.6, -8);
City[j++] = new city("哈密", 42.8, -92.4, -8);
City[j++] = new city("桂林", 25.2, -109.2, -8);
City[j++] = new city("柳州", 24.3, -108.4, -8);
City[j++] = new city("南宁", 22.8, -107.3, -8);
City[j++] = new city("广州", 23.1, -112.2, -8);
City[j++] = new city("汕头", 23.3, -115.6, -8);
City[j++] = new city("海口", 20.0, -109.3, -8);
City[j++] = new city("成都", 30.6, -103.1, -8);
City[j++] = new city("重庆", 29.5, -105.5, -8);
City[j++] = new city("贵阳", 26.6, -105.7, -8);
City[j++] = new city("昆明", 25.0, -101.7, -8);
City[j++] = new city("拉萨", 29.6, -90.1, -8);
City[j++] = new city("郑州", 34.7, -112.6, -8);
City[j++] = new city("洛阳", 34.6, -111.4, -8);
City[j++] = new city("福州", 26.6, -118.3, -8);
City[j++] = new city("厦门", 24.4, -117.1, -8);
City[j++] = new city("台北", 25.0, -120.5, -8);
City[j++] = new city("高雄", 22.0, -101.3, -8);
City[j++] = new city("香港", 22.25, -114.1667, -8);
City[j++] = new city("", 0, 0, 0);
City[j++] = new city("世界城市", 0, 0, 0);
City[j++] = new city("纽约,美国", 40.7167, 74.0167, 5);
City[j++] = new city("柏林,德国", 52.33, -13.30, -1);
City[j++] = new city("孟买,印度", 18.9333, -72.8333, -5.5);
City[j++] = new city("布宜诺斯艾利斯, 阿根廷", -34.60, 58.45, 3);
City[j++] = new city("开罗,埃及", 30.10, -31.3667, -2);
City[j++] = new city("开普敦,南非", -33.9167, -18.3667, -2);
City[j++] = new city("加拉加斯,委内瑞拉", 10.50, 66.9333, 4);
City[j++] = new city("赫尔辛基,芬兰", 60.1667, -24.9667, -2);
City[j++] = new city("洛杉机,美国", 34.05, 118.233, 8);
City[j++] = new city("耶路撒冷,巴基斯坦", 31.7833, -35.2333, -2);
City[j++] = new city("伦敦,英国", 51.50, 0.1667, 0);
City[j++] = new city("墨西哥城,墨西哥", 19.4, 99.15, 6);
City[j++] = new city("莫斯科,俄罗斯", 55.75, -37.5833, -3);
City[j++] = new city("新德里,印度", 28.6, -77.2, -5.5);
City[j++] = new city("渥太华,加拿大", 45.41667, 75.7, 5);
City[j++] = new city("巴黎,法国", 48.8667, -2.667, -1);
City[j++] = new city("圣保罗,巴西", -22.90, 43.2333, 3);
City[j++] = new city("利雅得,沙特阿拉伯", 24.633, -46.71667, -3);
City[j++] = new city("罗马,意大利", 41.90, -12.4833, -1);
City[j++] = new city("悉尼,澳大利亚", -33.8667, -151.2167, -10);
City[j++] = new city("东京,日本", 35.70, -139.7667, -9);
City[j++] = new city("苏黎世,瑞士", 47.3833, -8.5333, -1);
//*********************************************************************/
//*********************************************************************/
function setLatLong(f, index) {
// Decimal degrees are passed in the array. Temporarily store these
// degs in lat and lon deg and have convLatLong modify them.
f["latDeg"].value = City[index].lat;
f["lonDeg"].value = City[index].lng;
// These are needed to prevent iterative adding of min and sec when
// set button is clicked.
f["latMin"].value = 0;
f["latSec"].value = 0;
f["lonMin"].value = 0;
f["lonSec"].value = 0;
//call convLatLong to convert decimal degrees into table form.
convLatLong(f);
//Local time zone value set in table
f["hrsToGMT"].value = City[index].zoneHr;
}
//*********************************************************************/
// isLeapYear returns 1 if the 4-digit yr is a leap year, 0 if it is not
function isLeapYear(yr) {
return ((yr % 4 == 0 && yr % 100 != 0) || yr % 400 == 0);
}
//*********************************************************************/
// isPosInteger returns false if the value is not a positive integer, true is
// returned otherwise. The code is from taken from Danny Goodman's Javascript
// Handbook, p. 372.
function isPosInteger(inputVal) {
inputStr = ("" + inputVal);
for (var i = 0; i < inputStr.length; i++) {
var oneChar = inputStr.charAt(i);
if (oneChar < "0" || oneChar > "9")
return false;
}
return true;
}
//*********************************************************************/
function isInteger(inputVal) {
inputStr = "" + inputVal;
if (inputStr == "NaN") return false;
if (inputStr == "-NaN") return false;
for (var i = 0; i < inputStr.length; i++) {
var oneChar = inputStr.charAt(i);
if (i == 0 && (oneChar == "-" || oneChar == "+")) {
continue;
}
if (oneChar < "0" || oneChar > "9") {
return false;
}
}
return true;
}
//*********************************************************************/
function isNumber(inputVal) {
var oneDecimal = false;
var inputStr = "" + inputVal;
for (var i = 0; i < inputStr.length; i++) {
var oneChar = inputStr.charAt(i);
if (i == 0 && (oneChar == "-" || oneChar == "+")) {
continue;
}
if (oneChar == "." && !oneDecimal) {
oneDecimal = true;
continue;
}
if (oneChar < "0" || oneChar > "9") {
return false;
}
}
return true;
}
//*********************************************************************/
// isValidInput makes sure valid input is entered before going ahead to
// calculate the sunrise and sunset. False is returned if an invalid entry
// was made, true is the entry is valid.
function isValidInput(f, index, latLongForm) {
if (f["day"].value == "") { // see if the day field is empty
//alert("You must enter a day before attempting the calculation.");
return false;
}
else if (f["year"].value == "") { // see if the year field is empty
//alert("You must enter a year before attempting the calculation.");
return false;
}
else if (!isPosInteger(f["day"].value) || f["day"].value == 0) {
//alert("The day must be a positive integer.");
return false;
}
else if (!isInteger(f["year"].value)) {
//alert("The year must be an integer.");
return false;
}
else if ((f["year"].value < -1000) || (f["year"].value > 3000)) {
//alert("The algorithm used is not valid for years outside of/nthe range -1000 to 3000.");
return false;
}
// For the non-February months see if the day entered is greater than
// the number of days in the selected month
else if ((index != 1) && (f["day"].value > monthList[index].numdays)) {
//alert("There are only " + monthList[index].numdays + " days in "+ monthList[index].name + ".");
return false;
}
// First see if the year entered is a leap year. If so we have to make sure
// the days entered is <= 29. If not a leap year we make sure that the days
// entered is <= 28.
else if (index == 1) { // month selected is February the screwball month
if (isLeapYear(f["year"].value)) { // year entered is a leap year
if (f["day"].value > (monthList[index].numdays + 1)) {
//alert("There are only " + (monthList[index].numdays + 1)
//+ " days in " + monthList[index].name + ".");
return false;
}
else
return true;
}
else { // year entered is not a leap year
if (f["day"].value > monthList[index].numdays) {
//alert("There are only " + monthList[index].numdays
//+ " days in " + monthList[index].name + ".");
return false;
}
else
return true;
}
}
else
return true;
}
//*********************************************************************/
//convLatLong converts any type of lat/long input
//into the table form and then handles bad input
//it is nested in the calcSun function.
function convLatLong(f) {
var neg = 0;
if (f["latDeg"].value[0] == '-') {
neg = 1;
}
if (neg != 1) {
var latSeconds = (parseFloat(f["latDeg"].value)) * 3600
+ parseFloat(f["latMin"].value) * 60
+ parseFloat(f["latSec"].value) * 1;
f["latDeg"].value = Math.floor(latSeconds / 3600);
f["latMin"].value = Math.floor((latSeconds
- (parseFloat(f["latDeg"].value) * 3600)) / 60);
f["latSec"].value = Math.floor((latSeconds
- (parseFloat(f["latDeg"].value) * 3600)
- (parseFloat(f["latMin"].value) * 60)) + 0.5);
}
else if (parseFloat(f["latDeg"].value) > -1) {
var latSeconds = parseFloat(f["latDeg"].value) * 3600
- parseFloat(f["latMin"].value) * 60
- parseFloat(f["latSec"].value) * 1;
f["latDeg"].value = "-0";
f["latMin"].value = Math.floor((-latSeconds) / 60);
f["latSec"].value = Math.floor((-latSeconds
- (parseFloat(f["latMin"].value) * 60)) + 0.5);
}
else {
var latSeconds = parseFloat(f["latDeg"].value) * 3600
- parseFloat(f["latMin"].value) * 60
- parseFloat(f["latSec"].value) * 1;
f["latDeg"].value = Math.ceil(latSeconds / 3600);
f["latMin"].value = Math.floor((-latSeconds
+ (parseFloat(f["latDeg"].value) * 3600)) / 60);
f["latSec"].value = Math.floor((-latSeconds
+ (parseFloat(f["latDeg"].value) * 3600)
- (parseFloat(f["latMin"].value) * 60)) + 0.5);
}
neg = 0;
if (f["lonDeg"].value[0] == '-') {
neg = 1;
}
if (neg != 1) {
var lonSeconds = parseFloat(f["lonDeg"].value) * 3600
+ parseFloat(f["lonMin"].value) * 60
+ parseFloat(f["lonSec"].value) * 1;
f["lonDeg"].value = Math.floor(lonSeconds / 3600);
f["lonMin"].value = Math.floor((lonSeconds
- (parseFloat(f["lonDeg"].value) * 3600)) / 60);
f["lonSec"].value = Math.floor((lonSeconds
- (parseFloat(f["lonDeg"].value) * 3600)
- (parseFloat(f["lonMin"].value)) * 60) + 0.5);
}
else if (parseFloat(f["lonDeg"].value) > -1) {
var lonSeconds = parseFloat(f["lonDeg"].value) * 3600
- parseFloat(f["lonMin"].value) * 60
- parseFloat(f["lonSec"].value) * 1;
f["lonDeg"].value = "-0";
f["lonMin"].value = Math.floor((-lonSeconds) / 60);
f["lonSec"].value = Math.floor((-lonSeconds
- (parseFloat(f["lonMin"].value) * 60)) + 0.5);
}
else {
var lonSeconds = parseFloat(f["lonDeg"].value) * 3600
- parseFloat(f["lonMin"].value) * 60
- parseFloat(f["lonSec"].value) * 1;
f["lonDeg"].value = Math.ceil(lonSeconds / 3600);
f["lonMin"].value = Math.floor((-lonSeconds
+ (parseFloat(f["lonDeg"].value) * 3600)) / 60);
f["lonSec"].value = Math.floor((-lonSeconds
+ (parseFloat(f["lonDeg"].value) * 3600)
- (parseFloat(f["lonMin"].value) * 60)) + 0.5);
}
//Test for invalid lat/long input
if (latSeconds > 324000) {
alert("You have entered an invalid latitude.\n Setting lat= 89.8.");
f["latDeg"].value = 89.8;
f["latMin"].value = 0;
f["latSec"].value = 0;
}
if (latSeconds < -324000) {
alert("You have entered an invalid latitude.\n Setting lat= -89.8.");
f["latDeg"].value = -89.8;
f["latMin"].value = 0;
f["latSec"].value = 0;
}
if (lonSeconds > 648000) {
alert("You have entered an invalid longitude.\n Setting lon= 180.");
f["lonDeg"].value = 180;
f["lonMin"].value = 0;
f["lonSec"].value = 0;
}
if (lonSeconds < -648000) {
alert("You have entered an invalid longitude.\n Setting lon= -180.");
f["lonDeg"].value = -180;
f["lonMin"].value = 0;
f["lonSec"].value = 0;
}
}
//***********************************************************************/
//***********************************************************************/
//* */
//*This section contains subroutines used in calculating solar position */
//* */
//***********************************************************************/
//***********************************************************************/
// Convert radian angle to degrees
function radToDeg(angleRad) {
return (180.0 * angleRad / Math.PI);
}
//*********************************************************************/
// Convert degree angle to radians
function degToRad(angleDeg) {
return (Math.PI * angleDeg / 180.0);
}
//*********************************************************************/
//***********************************************************************/
//* Name: calcDayOfYear */
//* Type: Function */
//* Purpose: Finds numerical day-of-year from mn, day and lp year info */
//* Arguments: */
//* month: January = 1 */
//* day : 1 - 31 */
//* lpyr : 1 if leap year, 0 if not */
//* Return value: */
//* The numerical day of year */
//***********************************************************************/
function calcDayOfYear(mn, dy, lpyr) {
var k = (lpyr ? 1 : 2);
var doy = Math.floor((275 * mn) / 9) - k * Math.floor((mn + 9) / 12) + dy - 30;
return doy;
}
//***********************************************************************/
//* Name: calcDayOfWeek */
//* Type: Function */
//* Purpose: Derives weekday from Julian Day */
//* Arguments: */
//* juld : Julian Day */
//* Return value: */
//* String containing name of weekday */
//***********************************************************************/
function calcDayOfWeek(juld) {
var A = (juld + 1.5) % 7;
var DOW = (A == 0) ? "Sunday" : (A == 1) ? "Monday" : (A == 2) ? "Tuesday" : (A == 3) ? "Wednesday" : (A == 4) ? "Thursday" : (A == 5) ? "Friday" : "Saturday";
return DOW;
}
//***********************************************************************/
//* Name: calcJD */
//* Type: Function */
//* Purpose: Julian day from calendar day */
//* Arguments: */
//* year : 4 digit year */
//* month: January = 1 */
//* day : 1 - 31 */
//* Return value: */
//* The Julian day corresponding to the date */
//* Note: */
//* Number is returned for start of day. Fractional days should be */
//* added later. */
//***********************************************************************/
function calcJD(year, month, day) {
if (month <= 2) {
year -= 1;
month += 12;
}
var A = Math.floor(year / 100);
var B = 2 - A + Math.floor(A / 4);
var JD = Math.floor(365.25 * (year + 4716)) + Math.floor(30.6001 * (month + 1)) + day + B - 1524.5;
return JD;
}
//***********************************************************************/
//* Name: calcDateFromJD */
//* Type: Function */
//* Purpose: Calendar date from Julian Day */
//* Arguments: */
//* jd : Julian Day */
//* Return value: */
//* String date in the form DD-MONTHNAME-YYYY */
//* Note: */
//***********************************************************************/
function calcDateFromJD(jd) {
var z = Math.floor(jd + 0.5);
var f = (jd + 0.5) - z;
if (z < 2299161) {
var A = z;
} else {
alpha = Math.floor((z - 1867216.25) / 36524.25);
var A = z + 1 + alpha - Math.floor(alpha / 4);
}
var B = A + 1524;
var C = Math.floor((B - 122.1) / 365.25);
var D = Math.floor(365.25 * C);
var E = Math.floor((B - D) / 30.6001);
var day = B - D - Math.floor(30.6001 * E) + f;
var month = (E < 14) ? E - 1 : E - 13;
var year = (month > 2) ? C - 4716 : C - 4715;
// alert ("date: " + day + "-" + monthList[month-1].name + "-" + year);
return (day + "-" + monthList[month - 1].name + "-" + year);
}
//***********************************************************************/
//* Name: calcDayFromJD */
//* Type: Function */
//* Purpose: Calendar day (minus year) from Julian Day */
//* Arguments: */
//* jd : Julian Day */
//* Return value: */
//* String date in the form DD-MONTH */
//***********************************************************************/
function calcDayFromJD(jd) {
var z = Math.floor(jd + 0.5);
var f = (jd + 0.5) - z;
if (z < 2299161) {
var A = z;
} else {
alpha = Math.floor((z - 1867216.25) / 36524.25);
var A = z + 1 + alpha - Math.floor(alpha / 4);
}
var B = A + 1524;
var C = Math.floor((B - 122.1) / 365.25);
var D = Math.floor(365.25 * C);
var E = Math.floor((B - D) / 30.6001);
var day = B - D - Math.floor(30.6001 * E) + f;
var month = (E < 14) ? E - 1 : E - 13;
var year = (month > 2) ? C - 4716 : C - 4715;
return ((day < 10 ? "0" : "") + day + monthList[month - 1].abbr);
}
//***********************************************************************/
//* Name: calcTimeJulianCent */
//* Type: Function */
//* Purpose: convert Julian Day to centuries since J2000.0. */
//* Arguments: */
//* jd : the Julian Day to convert */
//* Return value: */
//* the T value corresponding to the Julian Day */
//***********************************************************************/
function calcTimeJulianCent(jd) {
var T = (jd - 2451545.0) / 36525.0;
return T;
}
//***********************************************************************/
//* Name: calcJDFromJulianCent */
//* Type: Function */
//* Purpose: convert centuries since J2000.0 to Julian Day. */
//* Arguments: */
//* t : number of Julian centuries since J2000.0 */
//* Return value: */
//* the Julian Day corresponding to the t value */
//***********************************************************************/
function calcJDFromJulianCent(t) {
var JD = t * 36525.0 + 2451545.0;
return JD;
}
//***********************************************************************/
//* Name: calGeomMeanLongSun */
//* Type: Function */
//* Purpose: calculate the Geometric Mean Longitude of the Sun */
//* Arguments: */
//* t : number of Julian centuries since J2000.0 */
//* Return value: */
//* the Geometric Mean Longitude of the Sun in degrees */
//***********************************************************************/
function calcGeomMeanLongSun(t) {
var L0 = 280.46646 + t * (36000.76983 + 0.0003032 * t);
while (L0 > 360.0) {
L0 -= 360.0;
}
while (L0 < 0.0) {
L0 += 360.0;
}
return L0; // in degrees
}
//***********************************************************************/
//* Name: calGeomAnomalySun */
//* Type: Function */
//* Purpose: calculate the Geometric Mean Anomaly of the Sun */
//* Arguments: */
//* t : number of Julian centuries since J2000.0 */
//* Return value: */
//* the Geometric Mean Anomaly of the Sun in degrees */
//***********************************************************************/
function calcGeomMeanAnomalySun(t) {
var M = 357.52911 + t * (35999.05029 - 0.0001537 * t);
return M; // in degrees
}
//***********************************************************************/
//* Name: calcEccentricityEarthOrbit */
//* Type: Function */
//* Purpose: calculate the eccentricity of earth's orbit */
//* Arguments: */
//* t : number of Julian centuries since J2000.0 */
//* Return value: */
//* the unitless eccentricity */
//***********************************************************************/
function calcEccentricityEarthOrbit(t) {
var e = 0.016708634 - t * (0.000042037 + 0.0000001267 * t);
return e; // unitless
}
//***********************************************************************/
//* Name: calcSunEqOfCenter */
//* Type: Function */
//* Purpose: calculate the equation of center for the sun */
//* Arguments: */
//* t : number of Julian centuries since J2000.0 */
//* Return value: */
//* in degrees */
//***********************************************************************/
function calcSunEqOfCenter(t) {
var m = calcGeomMeanAnomalySun(t);
var mrad = degToRad(m);
var sinm = Math.sin(mrad);
var sin2m = Math.sin(mrad + mrad);
var sin3m = Math.sin(mrad + mrad + mrad);
var C = sinm * (1.914602 - t * (0.004817 + 0.000014 * t)) + sin2m * (0.019993 - 0.000101 * t) + sin3m * 0.000289;
return C; // in degrees
}
//***********************************************************************/
//* Name: calcSunTrueLong */
//* Type: Function */
//* Purpose: calculate the true longitude of the sun */
//* Arguments: */
//* t : number of Julian centuries since J2000.0 */
//* Return value: */
//* sun's true longitude in degrees */
//***********************************************************************/
function calcSunTrueLong(t) {
var l0 = calcGeomMeanLongSun(t);
var c = calcSunEqOfCenter(t);
var O = l0 + c;
return O; // in degrees
}
//***********************************************************************/
//* Name: calcSunTrueAnomaly */
//* Type: Function */
//* Purpose: calculate the true anamoly of the sun */
//* Arguments: */
//* t : number of Julian centuries since J2000.0 */
//* Return value: */
//* sun's true anamoly in degrees */
//***********************************************************************/
function calcSunTrueAnomaly(t) {
var m = calcGeomMeanAnomalySun(t);
var c = calcSunEqOfCenter(t);
var v = m + c;
return v; // in degrees
}
//***********************************************************************/
//* Name: calcSunRadVector */
//* Type: Function */
//* Purpose: calculate the distance to the sun in AU */
//* Arguments: */
//* t : number of Julian centuries since J2000.0 */
//* Return value: */
//* sun radius vector in AUs */
//***********************************************************************/
function calcSunRadVector(t) {
var v = calcSunTrueAnomaly(t);
var e = calcEccentricityEarthOrbit(t);
var R = (1.000001018 * (1 - e * e)) / (1 + e * Math.cos(degToRad(v)));
return R; // in AUs
}
//***********************************************************************/
//* Name: calcSunApparentLong */
//* Type: Function */
//* Purpose: calculate the apparent longitude of the sun */
//* Arguments: */
//* t : number of Julian centuries since J2000.0 */
//* Return value: */
//* sun's apparent longitude in degrees */
//***********************************************************************/
function calcSunApparentLong(t) {
var o = calcSunTrueLong(t);
var omega = 125.04 - 1934.136 * t;
var lambda = o - 0.00569 - 0.00478 * Math.sin(degToRad(omega));
return lambda; // in degrees
}
//***********************************************************************/
//* Name: calcMeanObliquityOfEcliptic */
//* Type: Function */
//* Purpose: calculate the mean obliquity of the ecliptic */
//* Arguments: */
//* t : number of Julian centuries since J2000.0 */
//* Return value: */
//* mean obliquity in degrees */
//***********************************************************************/
function calcMeanObliquityOfEcliptic(t) {
var seconds = 21.448 - t * (46.8150 + t * (0.00059 - t * (0.001813)));
var e0 = 23.0 + (26.0 + (seconds / 60.0)) / 60.0;
return e0; // in degrees
}
//***********************************************************************/
//* Name: calcObliquityCorrection */
//* Type: Function */
//* Purpose: calculate the corrected obliquity of the ecliptic */
//* Arguments: */
//* t : number of Julian centuries since J2000.0 */
//* Return value: */
//* corrected obliquity in degrees */
//***********************************************************************/
function calcObliquityCorrection(t) {
var e0 = calcMeanObliquityOfEcliptic(t);
var omega = 125.04 - 1934.136 * t;
var e = e0 + 0.00256 * Math.cos(degToRad(omega));
return e; // in degrees
}
//***********************************************************************/
//* Name: calcSunRtAscension */
//* Type: Function */
//* Purpose: calculate the right ascension of the sun */
//* Arguments: */
//* t : number of Julian centuries since J2000.0 */
//* Return value: */
//* sun's right ascension in degrees */
//***********************************************************************/
function calcSunRtAscension(t) {
var e = calcObliquityCorrection(t);
var lambda = calcSunApparentLong(t);
var tananum = (Math.cos(degToRad(e)) * Math.sin(degToRad(lambda)));
var tanadenom = (Math.cos(degToRad(lambda)));
var alpha = radToDeg(Math.atan2(tananum, tanadenom));
return alpha; // in degrees
}
//***********************************************************************/
//* Name: calcSunDeclination */
//* Type: Function */
//* Purpose: calculate the declination of the sun */
//* Arguments: */
//* t : number of Julian centuries since J2000.0 */
//* Return value: */
//* sun's declination in degrees */
//***********************************************************************/
function calcSunDeclination(t) {
var e = calcObliquityCorrection(t);
var lambda = calcSunApparentLong(t);
var sint = Math.sin(degToRad(e)) * Math.sin(degToRad(lambda));
var theta = radToDeg(Math.asin(sint));
return theta; // in degrees
}
//***********************************************************************/
//* Name: calcEquationOfTime */
//* Type: Function */
//* Purpose: calculate the difference between true solar time and mean */
//* solar time */
//* Arguments: */
//* t : number of Julian centuries since J2000.0 */
//* Return value: */
//* equation of time in minutes of time */
//***********************************************************************/
function calcEquationOfTime(t) {
var epsilon = calcObliquityCorrection(t);
var l0 = calcGeomMeanLongSun(t);
var e = calcEccentricityEarthOrbit(t);
var m = calcGeomMeanAnomalySun(t);
var y = Math.tan(degToRad(epsilon) / 2.0);
y *= y;
var sin2l0 = Math.sin(2.0 * degToRad(l0));
var sinm = Math.sin(degToRad(m));
var cos2l0 = Math.cos(2.0 * degToRad(l0));
var sin4l0 = Math.sin(4.0 * degToRad(l0));
var sin2m = Math.sin(2.0 * degToRad(m));
var Etime = y * sin2l0 - 2.0 * e * sinm + 4.0 * e * y * sinm * cos2l0
- 0.5 * y * y * sin4l0 - 1.25 * e * e * sin2m;
return radToDeg(Etime) * 4.0; // in minutes of time
}
//***********************************************************************/
//* Name: calcHourAngleSunrise */
//* Type: Function */
//* Purpose: calculate the hour angle of the sun at sunrise for the */
//* latitude */
//* Arguments: */
//* lat : latitude of observer in degrees */
//* solarDec : declination angle of sun in degrees */
//* Return value: */
//* hour angle of sunrise in radians */
//***********************************************************************/
function calcHourAngleSunrise(lat, solarDec) {
var latRad = degToRad(lat);
var sdRad = degToRad(solarDec)
var HAarg = (Math.cos(degToRad(90.833)) / (Math.cos(latRad) * Math.cos(sdRad)) - Math.tan(latRad) * Math.tan(sdRad));
var HA = (Math.acos(Math.cos(degToRad(90.833)) / (Math.cos(latRad) * Math.cos(sdRad)) - Math.tan(latRad) * Math.tan(sdRad)));
return HA; // in radians
}
//***********************************************************************/
//* Name: calcHourAngleSunset */
//* Type: Function */
//* Purpose: calculate the hour angle of the sun at sunset for the */
//* latitude */
//* Arguments: */
//* lat : latitude of observer in degrees */
//* solarDec : declination angle of sun in degrees */
//* Return value: */
//* hour angle of sunset in radians */
//***********************************************************************/
function calcHourAngleSunset(lat, solarDec) {
var latRad = degToRad(lat);
var sdRad = degToRad(solarDec)
var HAarg = (Math.cos(degToRad(90.833)) / (Math.cos(latRad) * Math.cos(sdRad)) - Math.tan(latRad) * Math.tan(sdRad));
var HA = (Math.acos(Math.cos(degToRad(90.833)) / (Math.cos(latRad) * Math.cos(sdRad)) - Math.tan(latRad) * Math.tan(sdRad)));
return -HA; // in radians
}
//***********************************************************************/
//* Name: calcSunriseUTC */
//* Type: Function */
//* Purpose: calculate the Universal Coordinated Time (UTC) of sunrise */
//* for the given day at the given location on earth */
//* Arguments: */
//* JD : julian day */
//* latitude : latitude of observer in degrees */
//* longitude : longitude of observer in degrees */
//* Return value: */
//* time in minutes from zero Z */
//***********************************************************************/
function calcSunriseUTC(JD, latitude, longitude) {
var t = calcTimeJulianCent(JD);
// *** First pass to approximate sunrise
var eqTime = calcEquationOfTime(t);
var solarDec = calcSunDeclination(t);
var hourAngle = calcHourAngleSunrise(latitude, solarDec);
var delta = longitude - radToDeg(hourAngle);
var timeDiff = 4 * delta; // in minutes of time
var timeUTC = 720 + timeDiff - eqTime; // in minutes
// alert("eqTime = " + eqTime + "\nsolarDec = " + solarDec + "\ntimeUTC = " + timeUTC);
// *** Second pass includes fractional jday in gamma calc
var newt = calcTimeJulianCent(calcJDFromJulianCent(t) + timeUTC / 1440.0);
eqTime = calcEquationOfTime(newt);
solarDec = calcSunDeclination(newt);
hourAngle = calcHourAngleSunrise(latitude, solarDec);
delta = longitude - radToDeg(hourAngle);
timeDiff = 4 * delta;
timeUTC = 720 + timeDiff - eqTime; // in minutes
// alert("eqTime = " + eqTime + "\nsolarDec = " + solarDec + "\ntimeUTC = " + timeUTC);
return timeUTC;
}
//***********************************************************************/
//* Name: calcSolNoonUTC */
//* Type: Function */
//* Purpose: calculate the Universal Coordinated Time (UTC) of solar */
//* noon for the given day at the given location on earth */
//* Arguments: */
//* t : number of Julian centuries since J2000.0 */
//* longitude : longitude of observer in degrees */
//* Return value: */
//* time in minutes from zero Z */
//***********************************************************************/
function calcSolNoonUTC(t, longitude) {
var newt = calcTimeJulianCent(calcJDFromJulianCent(t) + 0.5 + longitude / 360.0);
var eqTime = calcEquationOfTime(t);
var solarNoonDec = calcSunDeclination(t);
var solNoonUTC = 720 + (longitude * 4) - eqTime; // min
return solNoonUTC;
}
//***********************************************************************/
//* Name: calcSunsetUTC */
//* Type: Function */
//* Purpose: calculate the Universal Coordinated Time (UTC) of sunset */
//* for the given day at the given location on earth */
//* Arguments: */
//* JD : julian day */
//* latitude : latitude of observer in degrees */
//* longitude : longitude of observer in degrees */
//* Return value: */
//* time in minutes from zero Z */
//***********************************************************************/
function calcSunsetUTC(JD, latitude, longitude) {
var t = calcTimeJulianCent(JD);
// First calculates sunrise and approx length of day
var eqTime = calcEquationOfTime(t);
var solarDec = calcSunDeclination(t);
var hourAngle = calcHourAngleSunset(latitude, solarDec);
var delta = longitude - radToDeg(hourAngle);
var timeDiff = 4 * delta;
var timeUTC = 720 + timeDiff - eqTime;
// first pass used to include fractional day in gamma calc
var newt = calcTimeJulianCent(calcJDFromJulianCent(t) + timeUTC / 1440.0);
eqTime = calcEquationOfTime(newt);
solarDec = calcSunDeclination(newt);
hourAngle = calcHourAngleSunset(latitude, solarDec);
delta = longitude - radToDeg(hourAngle);
timeDiff = 4 * delta;
timeUTC = 720 + timeDiff - eqTime; // in minutes
return timeUTC;
}
//*********************************************************************/
// Returns the decimal latitude from the degrees, minutes and seconds entered
// into the form
function getLatitude(latLongForm) {
var neg = 0;
var degs = parseFloat(latLongForm["latDeg"].value);
if (latLongForm["latDeg"].value[0] == '-') {
neg = 1;
}
var mins = parseFloat(latLongForm["latMin"].value);
var secs = parseFloat(latLongForm["latSec"].value);
if (neg != 1) {
var decLat = degs + (mins / 60) + (secs / 3600);
}
else if (neg == 1) {
var decLat = degs - (mins / 60) - (secs / 3600);
} else {
return -9999;
}
return decLat;
}
//*********************************************************************/
// Returns the decimal longitude from the degrees, minutes and seconds entered
// into the form
function getLongitude(latLongForm) {
var neg = 0;
var degs = parseFloat(latLongForm["lonDeg"].value);
if (latLongForm["lonDeg"].value[0] == '-') {
neg = 1;
}
var mins = parseFloat(latLongForm["lonMin"].value);
var secs = parseFloat(latLongForm["lonSec"].value);
var decLon = degs + (mins / 60) + (secs / 3600);
if (neg != 1) {
var decLon = degs + (mins / 60) + (secs / 3600);
} else if (neg == 1) {
var decLon = degs - (mins / 60) - (secs / 3600);
} else {
return -9999;
}
return decLon;
}
//***********************************************************************/
//* Name: findRecentSunrise */
//* Type: Function */
//* Purpose: calculate the julian day of the most recent sunrise */
//* starting from the given day at the given location on earth */
//* Arguments: */
//* JD : julian day */
//* latitude : latitude of observer in degrees */
//* longitude : longitude of observer in degrees */
//* Return value: */
//* julian day of the most recent sunrise */
//***********************************************************************/
function findRecentSunrise(jd, latitude, longitude) {
var julianday = jd;
var time = calcSunriseUTC(julianday, latitude, longitude);
while (!isNumber(time)) {
julianday -= 1.0;
time = calcSunriseUTC(julianday, latitude, longitude);
}
return julianday;
}
//***********************************************************************/
//* Name: findRecentSunset */
//* Type: Function */
//* Purpose: calculate the julian day of the most recent sunset */
//* starting from the given day at the given location on earth */
//* Arguments: */
//* JD : julian day */
//* latitude : latitude of observer in degrees */
//* longitude : longitude of observer in degrees */
//* Return value: */
//* julian day of the most recent sunset */
//***********************************************************************/
function findRecentSunset(jd, latitude, longitude) {
var julianday = jd;
var time = calcSunsetUTC(julianday, latitude, longitude);
while (!isNumber(time)) {
julianday -= 1.0;
time = calcSunsetUTC(julianday, latitude, longitude);
}
return julianday;
}
//***********************************************************************/
//* Name: findNextSunrise */
//* Type: Function */
//* Purpose: calculate the julian day of the next sunrise */
//* starting from the given day at the given location on earth */
//* Arguments: */
//* JD : julian day */
//* latitude : latitude of observer in degrees */
//* longitude : longitude of observer in degrees */
//* Return value: */
//* julian day of the next sunrise */
//***********************************************************************/
function findNextSunrise(jd, latitude, longitude) {
var julianday = jd;
var time = calcSunriseUTC(julianday, latitude, longitude);
while (!isNumber(time)) {
julianday += 1.0;
time = calcSunriseUTC(julianday, latitude, longitude);
}
return julianday;
}
//***********************************************************************/
//* Name: findNextSunset */
//* Type: Function */
//* Purpose: calculate the julian day of the next sunset */
//* starting from the given day at the given location on earth */
//* Arguments: */
//* JD : julian day */
//* latitude : latitude of observer in degrees */
//* longitude : longitude of observer in degrees */
//* Return value: */
//* julian day of the next sunset */
//***********************************************************************/
function findNextSunset(jd, latitude, longitude) {
var julianday = jd;
var time = calcSunsetUTC(julianday, latitude, longitude);
while (!isNumber(time)) {
julianday += 1.0;
time = calcSunsetUTC(julianday, latitude, longitude);
}
return julianday;
}
//***********************************************************************/
//* Name: timeString */
//* Type: Function */
//* Purpose: convert time of day in minutes to a zero-padded string */
//* suitable for printing to the form text fields */
//* Arguments: */
//* minutes : time of day in minutes */
//* Return value: */
//* string of the format HH:MM:SS, minutes and seconds are zero padded*/
//***********************************************************************/
function timeString(minutes)
// timeString returns a zero-padded string (HH:MM:SS) given time in minutes
{
var floatHour = minutes / 60;
var hour = Math.floor(floatHour);
var floatMinute = 60 * (floatHour - Math.floor(floatHour));
var minute = Math.floor(floatMinute);
var floatSec = 60 * (floatMinute - Math.floor(floatMinute));
var second = Math.floor(floatSec);
var timeStr = hour + ":";
if (minute < 10) // i.e. only one digit
timeStr += "0" + minute + ":";
else
timeStr += minute + ":";
if (second < 10) // i.e. only one digit
timeStr += "0" + second;
else
timeStr += second;
return timeStr;
}
//***********************************************************************/
//* Name: timeStringShortAMPM */
//* Type: Function */
//* Purpose: convert time of day in minutes to a zero-padded string */
//* suitable for printing to the form text fields. If time */
//* crosses a day boundary, date is appended. */
//* Arguments: */
//* minutes : time of day in minutes */
//* JD : julian day */
//* Return value: */
//* string of the format HH:MM[AM/PM] (DDMon) */
//***********************************************************************/
// timeStringShortAMPM returns a zero-padded string (HH:MM *M) given time in
// minutes and appends short date if time is > 24 or < 0, resp.
function timeStringShortAMPM(minutes, JD) {
var julianday = JD;
var floatHour = minutes / 60;
var hour = Math.floor(floatHour);
var floatMinute = 60 * (floatHour - Math.floor(floatHour));
var minute = Math.floor(floatMinute);
var floatSec = 60 * (floatMinute - Math.floor(floatMinute));
var second = Math.floor(floatSec);
var PM = false;
minute += (second >= 30) ? 1 : 0;
if (minute >= 60) {
minute -= 60;
hour++;
}
var daychange = false;
if (hour > 23) {
hour -= 24;
daychange = true;
julianday += 1.0;
}
if (hour < 0) {
hour += 24;
daychange = true;
julianday -= 1.0;
}
//if (hour > 11)
// {
// hour -= 12;
// PM = true;
// }
if (hour == 0) {
PM = false;
hour = 12;
}
var timeStr = hour + ":";
if (minute < 10) // i.e. only one digit
timeStr += "0" + minute; //+ ((PM)?"PM":"AM");
else
timeStr += "" + minute; // + ((PM)?"PM":"AM");
if (daychange) return timeStr + " " + calcDayFromJD(julianday);
return timeStr;
}
//***********************************************************************/
//* Name: timeStringAMPMDate */
//* Type: Function */
//* Purpose: convert time of day in minutes to a zero-padded string */
//* suitable for printing to the form text fields, and appends */
//* the date. */
//* Arguments: */
//* minutes : time of day in minutes */
//* JD : julian day */
//* Return value: */
//* string of the format HH:MM[AM/PM] DDMon */
//***********************************************************************/
// timeStringAMPMDate returns a zero-padded string (HH:MM[AM/PM]) given time
// in minutes and julian day, and appends the short date
function timeStringAMPMDate(minutes, JD) {
var julianday = JD;
var floatHour = minutes / 60;
var hour = Math.floor(floatHour);
var floatMinute = 60 * (floatHour - Math.floor(floatHour));
var minute = Math.floor(floatMinute);
var floatSec = 60 * (floatMinute - Math.floor(floatMinute));
var second = Math.floor(floatSec);
minute += (second >= 30) ? 1 : 0;
if (minute >= 60) {
minute -= 60;
hour++;
}
if (hour > 23) {
hour -= 24;
julianday += 1.0;
}
if (hour < 0) {
hour += 24;
julianday -= 1.0;
}
var PM = false;
if (hour > 11) {
hour -= 12;
PM = true;
}
if (hour == 0) {
PM = false;
hour = 12;
}
var timeStr = hour + ":";
if (minute < 10) // i.e. only one digit
timeStr += "0" + minute + ((PM) ? "PM" : "AM");
else
timeStr += minute + ((PM) ? "PM" : "AM");
return timeStr + " " + calcDayFromJD(julianday);
}
//***********************************************************************/
//* Name: timeStringDate */
//* Type: Function */
//* Purpose: convert time of day in minutes to a zero-padded 24hr time */
//* suitable for printing to the form text fields. If time */
//* crosses a day boundary, date is appended. */
//* Arguments: */
//* minutes : time of day in minutes */
//* JD : julian day */
//* Return value: */
//* string of the format HH:MM (DDMon) */
//***********************************************************************/
// timeStringDate returns a zero-padded string (HH:MM) given time in minutes
// and julian day, and appends the short date if time crosses a day boundary
function timeStringDate(minutes, JD) {
var julianday = JD;
var floatHour = minutes / 60;
var hour = Math.floor(floatHour);
var floatMinute = 60 * (floatHour - Math.floor(floatHour));
var minute = Math.floor(floatMinute);
var floatSec = 60 * (floatMinute - Math.floor(floatMinute));
var second = Math.floor(floatSec);
minute += (second >= 30) ? 1 : 0;
if (minute >= 60) {
minute -= 60;
hour++;
}
var daychange = false;
if (hour > 23) {
hour -= 24;
julianday += 1.0;
daychange = true;
}
if (hour < 0) {
hour += 24;
julianday -= 1.0;
daychange = true;
}
var timeStr = hour + ":";
if (minute < 10) // i.e. only one digit
timeStr += "0" + minute;
else
timeStr += minute;
if (daychange) return timeStr + " " + calcDayFromJD(julianday);
return timeStr;
}
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